package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import com.sky.vo.EmployeeLoginVO;
import com.sky.vo.EmployeeVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.security.MessageDigest;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */

    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对，一个数据库密码（加密密码），一个是前端密码（明文密码）
        // 思路：进行密码比对（把前端密码MD5加密一下，然后与数据库的进行比对）
        String md5Password = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!md5Password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    @Override
    public Integer addEmp(EmployeeDTO employeeDTO) {
        log.info("[Service],{}",Thread.currentThread().getId());
        // 把DTO转实体类
        Employee employee  = new Employee();
        BeanUtils.copyProperties(employeeDTO,employee);
        // 设置实体类对象的默认数据
        employee.setCreateTime(LocalDateTime.now());
        employee.setUpdateTime(LocalDateTime.now());
        // 设置登录的用户ID,从ThreadLocal获取数据
        Long loginUserId = BaseContext.getCurrentId();
        employee.setCreateUser(loginUserId);
        employee.setUpdateUser(loginUserId);
        // 设置员工状态
        employee.setStatus(1);
        // 设置默认密码
        employee.setPassword(DigestUtils.md5DigestAsHex("123456".getBytes()));
        return employeeMapper.insertEmp(employee);
    }

    @Override
    public PageResult findByPageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        // 设置分页插件
        PageHelper.startPage(employeePageQueryDTO.getPage(),employeePageQueryDTO.getPageSize());

        List<Employee> employeeList = employeeMapper.selectByPage(employeePageQueryDTO.getName());

        Page<Employee> employeePage = (Page<Employee>)employeeList;
        PageResult pageResult = new PageResult();
        // 从Page对象获取结果集和总条数
        pageResult.setTotal(employeePage.getTotal());
        pageResult.setRecords(employeePage.getResult());
        return pageResult;
    }

    @Override
    public Integer qiJinStatus(Integer status, Long id) {
        Employee employee = Employee.builder()
                .id(id)
                .status(status)
                .build();
        // 调用mapper的公共方法，基于ID，修改员工信息
        return employeeMapper.updateById(employee);
    }

    @Override
    public EmployeeVO findById(Long id) {
        Employee employee = employeeMapper.selectById(id);
        // 把实体类对象，转VO对象
        EmployeeVO employeeVO = new EmployeeVO();
        if(employee != null){
            BeanUtils.copyProperties(employee,employeeVO);
        }
        return employeeVO;
    }

    @Override
    public Integer updateById(EmployeeDTO employeeDTO) {
        // 调用mapper,更新
        // service调用mapper,需要把DTO->实体类
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO,employee);
        // 设置当前对象的更新时间和当前登录用户的ID
        employee.setUpdateTime(LocalDateTime.now());
        employee.setUpdateUser(BaseContext.getCurrentId());
        // employee 此时对象少什么
        log.info("【更新数据库前】 employee:{}",employee);
        return employeeMapper.updateById(employee);
    }


    public static String getMD5(String input) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] messageDigest = md.digest(input.getBytes());
            StringBuilder hexString = new StringBuilder();

            for (byte b : messageDigest) {
                hexString.append(String.format("%02x", b));
            }

            return hexString.toString();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}
